U.S. patent application number 10/263878 was filed with the patent office on 2004-04-08 for plastic bag with bottom enhancement arrangement and producing method thereof.
Invention is credited to Yi Li, Jenny Jie.
Application Number | 20040066988 10/263878 |
Document ID | / |
Family ID | 32042100 |
Filed Date | 2004-04-08 |
United States Patent
Application |
20040066988 |
Kind Code |
A1 |
Yi Li, Jenny Jie |
April 8, 2004 |
Plastic bag with bottom enhancement arrangement and producing
method thereof
Abstract
A plastic bag includes a bag body having an top opening, a
bottom edge, and a trash chamber defining therebetween, and a
bottom enhancement arrangement including a sealing edge formed
along the bottom edge of the bag body in such a manner that when
the bag body is folded into an usage condition, the sealing edge is
inwardly flipped into the trash chamber while two bottom side
portions of the bag body is downwardly folded to form a round
bottom portion of the trash chamber for evenly distributing a
weight of the trashes so as to protect the sealing edge from being
broken by means of the weight of the trashes.
Inventors: |
Yi Li, Jenny Jie; (Los
Angeles, CA) |
Correspondence
Address: |
Raymond Y. Chan
Suite 128
108 N. Ynez Avenue
Monterey Park
CA
91754
US
|
Family ID: |
32042100 |
Appl. No.: |
10/263878 |
Filed: |
October 4, 2002 |
Current U.S.
Class: |
383/120 ;
383/121; 493/244 |
Current CPC
Class: |
B31B 70/64 20170801;
B65D 31/02 20130101; B65D 31/06 20130101; B65D 33/02 20130101; B31B
70/008 20170801; B65F 1/0006 20130101 |
Class at
Publication: |
383/120 ;
383/121; 493/244 |
International
Class: |
B65D 030/20; B31B
001/26 |
Claims
What is claimed is:
1. A plastic bag, comprising: a bag body having an top opening, a
bottom edge, and a chamber defined therein, wherein said bag body
is adapted to be folded from a storage condition to an usage
condition, wherein at the storage condition, said bag body is
overlapped to form a longitudinal strap liked shape, and at the
usage condition, said bag body is unfolded to expand said chamber
with a round bottom portion for object collection; and a bottom
enhancement arrangement comprising means for sealing said bottom
edge of said bag body to form a sealing edge of said bag body in
such a manner that when said bag body is folded into the usage
condition, said sealing edge is inwardly flipped inside said
chamber while two bottom side portions of said bag body are
downwardly folded to form said round bottom portion of said
chamber, thereby a weight of objects collected within said chamber
is evenly distributed so as to protect said sealing edge from being
broken due to the weight of the objects.
2. The plastic bag, as recited in claim 1, wherein when said bag
body is in the storage condition, said bag body has two outer
covering layers, each having a longitudinal outer covering edge and
a longitudinal inner covering edge, and two inner lining layers,
each having a longitudinal outer lining edge and a longitudinal
inner lining edge, overlappedly disposed between said two outer
covering layers in layer by layer manner, wherein two outer sides
of said outer covering layers are integrally connected at said
inner covering edges thereof and two inner sides of said lining
layers are integrally connected at said inner lining edges thereof,
wherein two inner sides of said inner covering edges of said outer
covering layers are integrally connected to two outer sides of said
inner lining edges of said inner lining layers respectively.
3. The plastic bag, as recited in claim 2, wherein a width of each
of said inner lining layers is slightly shorter than that of each
of said outer covering layers in such a manner that when said bag
body is in the storage condition, said inner lining layers are
overlappedly and fittedly sandwiched between said outer covering
layers so as to form said longitudinal strap liked shape.
4. The plastic bag, as recited in claim 2, wherein a width of each
of said inner lining layers is shorter than that of each of said
outer covering layers in such a manner that when said bag body is
unfolded to the usage condition, said space of said chamber is
substantially reduced by said width of said inner lining
layers.
5. The plastic bag, as recited in claim 1, wherein said sealing
means comprises at least a welding line made along said bottom edge
of said bag body at the storage condition to form said sealing edge
thereof.
6. The plastic bag, as recited in claim 2, wherein said sealing
means comprises at least a welding line made along said bottom edge
of said bag body at the storage condition to form said sealing edge
thereof.
7. The plastic bag, as recited in claim 3, wherein said sealing
means comprises at least a welding line made along said bottom edge
of said bag body at the storage condition to form said sealing edge
thereof.
8. The plastic bag, as recited in claim 4, wherein said sealing
means comprises at least a welding line made along said bottom edge
of said bag body at the storage condition to form said sealing edge
thereof.
9. The plastic bag, as recited in claim 1, wherein the plastic bag
is constructed by a producing method comprising the steps of: (a)
forming a plastic tubular body having two opening ends and two
longitudinal half sections with respect to a centerline of said
tubular body, wherein each of said longitudinal half sections has
an outer longitudinal edge extended from one opening end to another
opening end, an outer longitudinal portion transversely extended
from said respective outer longitudinal edge, and an inner
longitudinal portion defined between said respective outer
longitudinal portion and said centerline; (b) inwardly folding each
of said outer longitudinal edges of said tubular body toward the
centerline thereof to overlappedly receive said outer longitudinal
portion in said inner longitudinal portion; (c) folding said two
longitudinal half sections with each other along said centerline of
said tubular body; and (d) sealing one of said opening ends of the
tubular body to form said bottom sealing edge of said plastic bag
while another opening end of said tubular body is constructed to be
said top opening of said bag body.
10. The plastic bag, as recited in claim 2, wherein the plastic bag
is constructed by a producing method comprising the steps of: (a)
forming a plastic tubular body having two opening ends and two
longitudinal half sections with respect to a centerline of said
tubular body, wherein each of said longitudinal half sections has
an outer longitudinal edge extended from one opening end to another
opening end, an outer longitudinal portion transversely extended
from said respective outer longitudinal edge, and an inner
longitudinal portion defined between said respective outer
longitudinal portion and said centerline; (b) inwardly folding each
of said outer longitudinal edges of said tubular body toward the
centerline thereof to overlappedly receive said outer longitudinal
portion in said inner longitudinal portion; (c) folding said two
longitudinal half sections with each other along said centerline of
said tubular body; and (d) sealing one of said opening ends of the
tubular body to form said bottom sealing edge of said plastic bag
while another opening end of said tubular body is constructed to be
said top opening of said bag body.
11. The plastic bag, as recited in claim 10, wherein in step (b),
said outer covering layers and said inner lining layers are
integrally formed by overlappedly folding said outer longitudinal
portions in said inner longitudinal portions respectively.
12. The plastic bag, as recited in claim 11, wherein a width of
each of said outer longitudinal portion is slightly shorter than
that of each of said inner longitudinal portion in such a manner
that after said outer longitudinal portion is overlappedly folded
in said inner longitudinal portion, a width of each of said inner
lining layers is slightly shorter than that of each of said outer
covering layers, so that said inner lining layers are overlappedly
and fittedly sandwiched between said outer covering layers so as to
form said longitudinal strap liked shape.
13. The plastic bag, as recited in claim 11, wherein a width of
each of said outer longitudinal portion is shorter than that of
each of said inner longitudinal portion in such a manner that after
said outer longitudinal portion is overlappedly folded in said
inner longitudinal portion, a width of each of said inner lining
layers is shorter than that of each of said outer covering layers,
so that when said bag body is unfolded to said usage condition,
said space of said chamber is substantially reduced by said width
of said inner lining layers.
14. A method of producing a plastic bag, comprising the steps of:
(a) forming a plastic tubular body having two opening ends and two
longitudinal half sections with respect to a centerline of said
tubular body, wherein each of said longitudinal half sections has
an outer longitudinal edge extended from one opening end to another
opening end, an outer longitudinal portion transversely extended
from said respective outer longitudinal edge, and an inner
longitudinal portion defined between said respective outer
longitudinal portion and said centerline; (b) inwardly folding each
of said outer longitudinal edges of said tubular body toward the
centerline thereof to overlappedly receive said outer longitudinal
portion in said inner longitudinal portion; (c) folding said two
longitudinal half sections with each other along said centerline of
said tubular body; and (d) sealing one of said opening ends of the
tubular body of said bag body to form a bottom sealing edge of said
plastic bag that is adapted to be folded from a storage condition
to an usage condition, wherein at the storage condition, said bag
body is overlapped to form a longitudinal strap liked shape, and at
the usage condition, said sealing edge is inwardly flipped into a
chamber of said bag body while two bottom side portions of said bag
body are downwardly folded to form a round bottom portion of said
chamber for evenly distributing a weight of objects collected
therein.
15. The method, as recited in claim 14, wherein when said bag body
is in the storage condition, said bag body has two outer covering
layers, each having a longitudinal outer covering edge and a
longitudinal inner covering edge, and two inner lining layers, each
having a longitudinal outer lining edge and a longitudinal inner
lining edge, overlappedly disposed between said two outer covering
layers in layer by layer manner, wherein two outer sides of said
outer covering layers are integrally connected at said inner
covering edges thereof and two inner sides of said lining layers
are integrally connected at said inner lining edges thereof,
wherein, two inner sides of said inner covering edges of said outer
covering layers are integrally connected to two outer sides of said
inner lining edges of said inner lining layers respectively.
16. The method as recited in claim 15, in the step (b), wherein
said outer covering layers and said inner lining layers are
integrally formed by overlappedly folding said outer longitudinal
portions in said inner longitudinal portions respectively.
17. The method, as recited in claim 16, wherein a width of each of
said outer longitudinal portion is slightly shorter than that of
each of said inner longitudinal portion in such a manner that after
said outer longitudinal portion is overlappedly folded in said
inner longitudinal portion, a width of each of said inner lining
layers is slightly shorter than that of each of said outer covering
layers, so that said inner lining layers are overlappedly and
fittedly sandwiched between said outer covering layers so as to
form said longitudinal strap liked shape.
18. The method, as recited in claim 16, wherein a width of each of
said outer longitudinal portion is shorter than that of each of
said inner longitudinal portion in such a manner that after said
outer longitudinal portion is overlappedly folded in said inner
longitudinal portion, a width of each of said inner lining layers
is shorter than that of each of said outer covering layers, so that
when said bag body is unfolded to said usage condition, said space
of said chamber is substantially reduced by said width of said
inner lining layers.
19. The method as recited in claim 17, in the step (d), wherein at
least a welding line is formed along said bottom edge of said bag
body at the storage condition to form said sealing edge
thereof.
20. The method as recited in claim 18, in the step (d), wherein at
least a welding line is formed along said bottom edge of said bag
body at the storage condition to form said sealing edge thereof.
Description
FIELD OF INVENTION
[0001] The present invention relates to a plastic bag, and more
particularly to a plastic bag with a bottom enhancement arrangement
and a producing method thereof, wherein the bottom enhancement
arrangement is capable of enhancing a strength of the plastic bag
to prevent the plastic bag from being broken at the bottom portion
thereof while the trash is collected in the plastic bag.
DESCRIPTION OF RELATED ARTS
[0002] A plastic bag is commonly used for collecting trash. The
user usually puts the plastic bag in a trashcan such that, when the
trashcan is full, the user can simply take out the plastic bag and
keep the trashcan clean.
[0003] A conventional manufacturing method of plastic bag comprises
the steps of: (a) placing a raw material into a mold to form a
hollow plastic piece; (b) providing a thermal cut on the plastic
piece to form a sealing line along the bottom edge of the plastic
bag so as to form a closed end at the bottom edge of the plastic
bag; and (c) overlappedly folding the plastic bag in a longitudinal
direction for storing purpose.
[0004] However, the conventional plastic bag has several drawbacks.
When the plastic bag is full, the weight of the trash will break
the seal of the bottom edge of the plastic bag. In order to lower
the cost of the plastic bag, the manufactures try to minimize the
use of raw material, i.e. the thickness of the plastic bag, so as
to weaken the sealing line at the bottom edge of the plastic
bag.
[0005] Especially, when the user puts the fluid formed trash, such
as soda or juice, into the plastic bag, the fluid trash will be
moved at one side of the plastic bag. Due to the uneven weight of
the trash inside the plastic bag, the fluid trash will break the
sealing line to form a slit in such a manner that the fluid trash
will leak through the slit.
[0006] Moreover, when the plastic bag is used to collect the solid
trash, the trash cannot fittedly fill into two bottom corner
portions of the plastic bag, such that the storing space at the two
corner portions of the plastic bag is wasted. Thus, the weight of
the trash is mainly distributed at a mid portion of the bottom edge
of the plastic bag. Therefore, the sealing line at the mid portion
of the bottom edge of the plastic bag will be broken easily even
though the plastic bag is not full yet.
[0007] To solve the above problem, the user can tie a knot at the
bottom portion of the plastic bag in such a manner that the bottom
portion of the plastic bag is formed in a spherical shape. It is
worth mentioning that the spherical shaped of the bottom portion of
the plastic bag can evenly distributed the weight of the trash
therein so as to prevent sealing line from being broken. In
addition, the sealing line is tightened up in the knot so as to
ensure the protection of the sealing line of the plastic bag. In
other words, when the knot is formed at the bottom portion of the
plastic bag, the plastic bag is capable of holding more weight of
trash than the plastic bag without the knot.
[0008] However, a certain storing space of the plastic bag is
wasted to compensate the form the knot since the bottom portion of
the plastic bag is used up. Furthermore, the weight of the trash,
especially the fluid trash, is concentrated at the knot to stretch
out the plastic bag such that once the knot is loosen, the sealing
line will be broken easily by overloading the trash in the plastic
bag. In addition, it is a hassle for the user to tie the knot for
every plastic bag, especially he or she must clean up the trashcan
every day such as in the restaurant or in the fast food shop.
SUMMARY OF THE PRESENT INVENTION
[0009] A main object of the present invention is to provide a
plastic bag with a bottom enhancement arrangement which is capable
of enhancing the strength of the plastic bag to prevent the plastic
bag from being broken at the bottom portion thereof while the trash
is collected in the plastic bag.
[0010] Another object of the present invention is to provide a
plastic bag with a bottom enhancement arrangement, wherein the
plastic bag is overlappedly folded into a compact size for storage.
When the plastic bag is unfolded to use, the bottom portion of the
plastic bag is formed in a round shape to evenly distribute the
weight of the trash. Therefore, the plastic bag of the present
invention is capable of holding 10-15% more weight of the trash
than the conventional plastic bag with the same thickness.
[0011] Another object of the present invention is to provide a
plastic bag with a bottom enhancement arrangement, wherein the
sealing line along the bottom portion of the plastic bag is folded
into the trash chamber when the plastic bag is unfolded to use, in
such a manner that the sealing line is tightened by the trash when
the trash is collected in the trash chamber of the plastic bag so
as to prevent the sealing line from being broken by the weight of
the trash.
[0012] Another object of the present invention is to provide a
method of producing a plastic bag with a bottom enhancement
arrangement, wherein the manufacturing method does not require
expensive machines and involved complicated structure so as to
minimize the manufacturing cost of the plastic bag incorporating
with the bottom enhancement arrangement.
[0013] Another object of the present invention is to provide a
method of producing a plastic bag with a bottom enhancement
arrangement, wherein the manufacturing method of the bottom
enhancement arrangement does not require any additional step in the
manufacturing process of the plastic bag, so as to provide a lower
cost of the plastic bag with enhanced strength thereof.
[0014] Accordingly, in order to accomplish the above objects, the
present invention provides a plastic bag comprising:
[0015] a bag body having an top opening, a bottom edge, and a trash
chamber defining therebetween, wherein the bag body is adapted to
be folded from a storage condition to an usage condition, wherein
at the storage condition, the bag body is overlapped to form a
longitudinal strap like shape, and at the usage condition, the bag
body is unfolded to expand a space of the trash chamber for
collecting trashes therein; and
[0016] a bottom enhancement arrangement comprising means for
sealing the bottom edge of the bag body to form a sealing edge of
the bag body in such a manner that when the bag body is folded into
the usage condition, the sealing edge is inwardly folded into the
trash chamber to provide a round shape bottom portion of the trash
chamber for evenly distributing a weight of the trashes so as to
protect the sealing edge from being broken by means of the weight
of the trashes.
[0017] In addition, the present invention further provides a method
of producing a plastic bag, comprising the steps of:
[0018] (a) deforming a raw material to form a plastic tubular body
having two opening ends and two longitudinal half sections with
respect to a centerline of the tubular body, wherein each of the
longitudinal half sections has an outer longitudinal edge extended
from one opening end to another opening end, an outer longitudinal
portion transversely extended from the respective outer
longitudinal edge, and an inner longitudinal portion defined
between the respective outer longitudinal portion and the
centerline;
[0019] (b) inwardly folding each of the outer longitudinal edges of
the tubular body toward the centerline thereof to overlappedly
receive the outer longitudinal portion in the inner longitudinal
portion;
[0020] (c) folding the two longitudinal half sections with each
other; and
[0021] (d) sealing one of the opening ends of the tubular body to
form a bottom sealing edge of the plastic bag.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] FIG. 1 is a perspective view of a plastic bag with a bottom
enhancement arrangement according to a preferred embodiment of the
present invention.
[0023] FIG. 2 illustrates the plastic bag with a bottom enhancement
arrangement in a storage condition according to the above preferred
embodiment of the present invention.
[0024] FIG. 3 illustrates the plastic bag with a bottom enhancement
arrangement in a usage condition according to the above preferred
embodiment of the present invention, showing the sealing edge of
the plastic bag folding into the trash chamber thereof.
[0025] FIG. 4 illustrates an alternative mode of the plastic bag
with a bottom enhancement arrangement according to the above
preferred embodiment of the present invention.
[0026] FIG. 5 is a perspective view of a tubular body of the
plastic bag according to the above preferred embodiment of the
present invention.
[0027] FIG. 6 is a flow diagram illustrating a method of producing
the plastic bag with a bottom enhancement arrangement according to
the above preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0028] Referring to FIGS. 1 through 3 of the drawings, a plastic
bag according to a preferred embodiment of the present invention is
illustrated, wherein the plastic bag comprises a bag body 10 and a
bottom enhancement arrangement 20.
[0029] The bag body 10 has an top opening 101, a bottom edge 102,
and a trash chamber 103 defining therebetween, wherein the bag body
10 is adapted to be folded from a storage condition to an usage
condition, wherein at the storage condition, the bag body 10 is
overlapped to form a longitudinal strap like shape, and at the
usage condition, the bag body 10 is unfolded to expand a space of
the trash chamber 103 with a round bottom portion 104 for
collecting trashes therein.
[0030] The bottom enhancement arrangement 20 comprises means 21 for
sealing the bottom edge 102 of the bag body 10 to form a sealing
edge 22 of the bag body 10 in such a manner that when the bag body
10 is folded into the usage condition, the sealing edge 22 is
inwardly flipped into the trash chamber 103 to provide a round
bottom portion 104 of the trash chamber 103 for evenly distributing
a weight of the trashes so as to protect the sealing edge 22 from
being broken by means of the weight of the trashes.
[0031] As shown in FIG. 1, when the bag body 10 is in the storage
condition, the bag body 10 has two outer covering layers 11, each
having a longitudinal outer covering edge 111 and a longitudinal
inner covering edge 112, and two inner lining layers 12, each
having a longitudinal outer lining edge 121 and a longitudinal
inner lining edge 122, overlappedly disposed between two outer
covering layers 11 in layer by layer manner, wherein two outer
sides of the outer covering layers 11 are integrally connected at
the inner covering edges 112 thereof and two inner sides of the
lining layers 12 are integrally connected at the inner lining edges
122 thereof. Moreover, two inner sides of the inner covering edges
112 of the outer covering layers 11 are integrally connected to two
outer sides of the inner lining edges 122 of the inner lining
layers 12 respectively. It is worth mentioning that each of the
outer covering layers 11 and the inner lining layers 12 is embodied
as two overlapped sheets in an edge to edge manner, as shown in
FIG. 1.
[0032] Accordingly, a width of each of the inner lining layers 12
is slightly shorter than that of each of the outer covering layers
11 in such a manner that when the bag body 10 is in the storage
condition, the inner lining layers 12 are overlappedly and fittedly
sandwiched between the outer covering layers 11 so as to form a
longitudinal strap liked shape, as shown in FIG. 2.
[0033] The sealing means 21 comprises at least one line of
ultrasonic welding spots 211 spacedly aligned along the bottom edge
102 of the bag body 10 at the storage condition to form the sealing
edge 22 thereof, in such a manner that the outer covering layers 11
and the inner lining layers 12 are sealedly bonded with each other
at the bottom edge 102 of the bag body 10. Accordingly, the
ultrasonic welding spots 211 are aligned closely together to
provide good sealing and affixing features.
[0034] When the bag body 10 is folded into the use condition, the
bottom edge 102 of the bag body 10 is folded inwardly to the trash
chamber 103 while two bottom side portions 105 of the bag body 10
are moved downwardly to form the round bottom portion 104 of the
bag body 10, as shown in FIG. 3.
[0035] Therefore, when the trashes are thrown in the trash chamber
103 of the bag body 10, the bottom edge 102 of the bag body 10 are
surrounded with the trashes. Due to the weight of the trashes, the
sealing edge 22 along the bottom edge 102 of the bag body 10 is
substantially gripped by the trashes to protect the sealing edge 22
of the bottom enhancement arrangement 20 from being broken so as to
prevent the trashes leaking from the bottom edge 102 of the bag
body 10, as shown in FIG. 3. In addition, no space of the trash
chamber 103 is wasted with respect to the bottom enhancement
arrangement 20 so that the bag body 10 is allowed to fully unfold
to maximize the space of the trash chamber 103.
[0036] It is worth mentioning that the round bottom portion 104 of
the trash chamber 103 is capable of enhancing the strength of the
bag body 10 since the weight of the trashes inside the trash
chamber 103 can be evenly distributed on the round bottom portion
104 thereof. Therefore, when the bag body 10 incorporated with the
bottom enhancement arrangement 20, the plastic bag of the present
invention is capable of holding 10 to 15% more weight of the trash
in comparison with the same thickness of the conventional plastic
bag. In other words, comparing the plastic bag of the present
invention with the conventional plastic bag, the bag body 10 of the
present invention can be 10 to 15% thinner than the convention
plastic bag to hold the same weight of the trash. Therefore, the
material cost of the plastic bag of the present invention is
substantially reduced while the strength of the plastic bag remains
the same.
[0037] Referring to FIGS. 5 and 6, the present invention further
comprises a method of producing the plastic bag with the bottom
enhancement arrangement 20, which comprises the following
steps.
[0038] (1) Deform a raw material M to form a plastic tubular body
30 having two opening ends 31 and two longitudinal half sections 32
with respect to a centerline 301 of the tubular body 30, wherein
each of the longitudinal half sections 32 has an outer longitudinal
edge 321 extended from one opening end 31 to another opening end
31, an outer longitudinal portion 322 transversely extended from
the respective outer longitudinal edge 321, and an inner
longitudinal portion 323 defined between the respective outer
longitudinal portion 322 and the centerline 301.
[0039] (2) Inwardly fold each of the outer longitudinal edges 321
of the tubular body 30 toward the centerline 301 thereof to
overlappedly receive the outer longitudinal portion 322 in the
inner longitudinal portion 323.
[0040] (3) Fold the two longitudinal half sections 32 with each
other along the centerline 301 of the tubular body 30.
[0041] (4) Seal one of the opening ends 31 of the tubular body 30
to form the bottom sealing edge 22 of the bag body 10 of the
plastic bag.
[0042] In step (1), the tubular body 30 is made of the plastic raw
material M by injection molding techniques commonly known to those
skilled in the art. The tubular body 30 basically is the bag body
10 when the bag body 10 is unfolded, wherein one of the opening
ends 31 of the tubular body 10 is constructed to be the top opening
101 of the bag body 10 while another opening ends 31 of the tubular
body 30 is constructed to be sealed to form the bottom edge 102 of
the bag body 10. Moreover, the centerline 301 of the tubular body
30 is defined at a longitudinal line thereof to form the two
identical longitudinal half sections 32 of the tubular body 30.
[0043] In step (2), the two outer longitudinal edges of the tubular
body 30 are inwardly folded to the centerline 301 thereof through a
mold M in such a manner that the outer longitudinal portion 322 of
the tubular body 30 is overlappedly disposed in the inner
longitudinal portion 323 thereof.
[0044] Accordingly, after overlappedly folding the outer
longitudinal portion 322 in the inner longitudinal portion 323,
each of the longitudinal half sections 32 forms the respective
outer covering layer 11 and the inner lining layer 12 of the bag
body 10 by the outer longitudinal portion 322 and the inner
longitudinal portion 323 of the tubular body 30.
[0045] In step (3), the bag body 10 is formed by overlappedly
folding the two longitudinal half sections 32 with each other along
the centerline 301 of the tubular body 30, wherein the two inner
lining layers 12 are overlappedly folded with each other and are
overlappedly sandwiched between the two outer covering layers
11.
[0046] In step (4), an ultrasonic welding device S is applied on
the bag body 10 along the respective opening end 31 to form the
line of ultrasonic welding spots 211 so as to form the sealing edge
22 sealed along the bottom edge 102 of the bag body 10.
Accordingly, the sealing means 20 can be a thermal cut along the
bottom edge 102 of the bag body 10 that the sealing technique is
commonly known to those skilled in the art.
[0047] In addition, a width of the outer longitudinal portion 322
of the tubular body 30 is slightly smaller than that of the inner
longitudinal portion 323 thereof, in such a manner that when the
outer longitudinal portion 322 is inwardly folded to overlap with
the inner longitudinal portion 323 so as to form the outer covering
layer 11 and the inner lining layer 12, the width of the outer
covering layer 11 is slightly larger than that of the inner lining
layer 12.
[0048] FIG. 4 illustrates an alternative mode of the bag body 10'
wherein the width of each of the outer covering layer 11' is larger
than that of each of the inner lining layer 12' in such a manner
that the space of the trash chamber 103' is substantially reduced
by shortening the width of the inner lining layers 12'.
Accordingly, a width of each of the outer longitudinal portions
322' of the tubular body 30' is shorter than that of each of the
inner longitudinal portions 323' thereof in such a manner that when
the outer longitudinal portions 322' are overlappedly folded into
the inner longitudinal portions 323' respectively, the width of
each of the outer covering layer 11' is larger than that of each of
the inner lining layer 12'. In other words, the size of the bag
body 10' can be easily adjusted by the folding method of the
tubular body 30'.
[0049] It is worth mentioning that a plurality of plastic bags of
the present invention are made during the manufacturing process
wherein the plastic bags are integrally attached with each other
head to tail and rolled up in a rolled manner for packaging as if
the manufacturing process of the conventional plastic bags.
Therefore, in step (4), a tearing line is formed next to the
sealing edge 21 is formed on the tubular body 30 in such a manner
that the user is able to tear off the plastic bag along the tearing
line so as to detach the plastic bag from the roll of the plastic
bags.
* * * * *